Comprehensive Description

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Description

Adult Lt 492–517 µm; LPh 191–196 µm to PhJIn at U39–U38 (Fig. 3). Body transparent, strap-shaped, dorsoventrally flattened, but vaulted dorsally; head pyriform, truncated apically, with a broad circumcephalic band of cilia at U02–U07, separated from the rest of the body by a long gradual neck constriction; trunk of medium width, sides of body broadest at the mid-body, and then narrowing behind to a rounded, slightly flaired caudum. Widths of head /neck /rear pharynx /midtrunk /caudal base /caudal flair, and locations along the length of the body are as follows: 43 /31 /36 /55 /36 /38 µm at U08 /U10 /U31 /U63 /U89 /U92, respectively. Cuticle is flexible; epidermis is finely granular; glands are lacking.  Adhesive tubes:TbA 4 per side (L 6–8 µm), thick, borne on broad fleshy asymmetrical hands that insert at U11–U12; TbVL 10 per side (L 10–16 µm), insert regularly from U24 to U66, three along the rear pharynx, the others along the fore- and midgut; TbV 2 per side (L 8–9 µm) occur amidst the TbVL series at U44 and U49; TbL/TbD absent; TbP 18 of varying lengths insert in more than one row around the rear of the rounded caudum, mostly projecting rearward (longer ones, L 8–10 µm, as # 1–2, 4, 6, 8–9 from either side, and shorter ones, L 5–7 µm, as # 3, 5, 7 from either side).  Ciliation:Three sensory hairs (L 7–15 µm) project forward on either side of the mouth and others (L 10–20 µm) project obliquely from the head; a broad band of cephalic cilia (L 15–20 µm) covers the head and joins the locomotor ciliature ventrally; 18–20 sensory hairs each occur regularly in lateral (L 4–6 µm), dorsolateral (L 10–14 µm) and dorsal (L 14–20 µm) columns along each side of the trunk. Ventral locomotor ciliature forms two longitudinal bands of short (L 4–6 µm), scattered cilia that follow the lateral body contours the entire length of the body, separate medially beneath the head and pharynx, but converging behind the anus and merging into a single band onto the caudum.  Digestive tract:Mouth terminal, but slightly inclined to the ventral surface, medium in width (10 µm diameter); buccal cavity semi-cylindrical, lightly cuticularized, having ca. 8 short longitudinal ridges set dorsally in the oral opening; pharynx of medium breadth, narrowest just before the well-developed, basal pharyngeal pores; intestine broad in front, narrowing behind; anus ventral at U92.  Reproductive tract:Hermaphroditic, probably protandrous; testes begin at the PhJIn (U34), with vasa deferentia continuing rearward past U50, but termini not seen; female system was not yet developed; frontal organ and caudal organ not seen.  Ecology:Sparse in frequency of occurrence (fewer than 10% of samples), scarce in abundance (3–5% of a sample);sublittoralin very fine to fine, well to medium-well sorted sand at 3 m water depth.

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© William D. Hummon

Source: ZooKeys

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